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Improvement of electrochemical performance of LiNi0.5Co0.2Mn0.3O2 by LaF3 coating at high cut-off voltage

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Abstract

A simple wet chemical method was used to coat a layer of LaF3 on the surface of LiNi0.5Co0.2Mn0.3O2(NCM523) to improve the electrochemical performance. Through the characterization of X-ray diffractometer (XRD), scanning electron microscope (SEM), X-ray energy dispersive spectrometer (EDS), and X-ray photoelectron spectroscopy (XPS), it can be seen that the LaF3 coating can be uniformly coated on the surface of the material and will not change the crystal structure and micro-morphology of the material. In this work, the amount of LaF3 coating on the materials is 0.0 wt%, 0.5 wt%, 1.0 wt%, and 2.0 wt%, respectively. Under the condition of the optimum coating amount of 1 wt%, the rate performance and cycle performance of the coated material can be improved obviously. After 100 cycles at a high cut-off voltage of 4.6 V, the capacity retention of the 1 wt% LaF3 coated material is 88.7%, which is higher than 80.4% of the bare material. And through EIS analysis, the coated material after 50 cycles still has excellent lithium ion diffusion kinetics. This may be due to the fact that an appropriate amount of LaF3 coating can effectively avoid direct contact between cathode materials and electrolytes, inhibit the generation of oxygen vacancies, and reduce unnecessary side effects. This could provide a new idea for improving the electrochemical performance of LiNi0.5Co0.2Mn0.3O2 at high cut-off voltage.

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  1. The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemistry and Materials Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, People’s Republic of China

    Huapeng Yang, Hailang Zhang & Wentao Zhao

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  1. Huapeng Yang
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  2. Hailang Zhang
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Yang, H., Zhang, H. & Zhao, W. Improvement of electrochemical performance of LiNi0.5Co0.2Mn0.3O2 by LaF3 coating at high cut-off voltage. Ionics 29, 1335–1345 (2023). https://doi.org/10.1007/s11581-023-04911-5

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